# Ecobee Smart Sensor consistency
**URL:** https://community.beestat.io/t/ecobee-smart-sensor-consistency/216
**Category:** Feedback & Discussion
**Created:** [August 16, 2020, 5:42am UTC](https://community.beestat.io/t/ecobee-smart-sensor-consistency/216 "2020-08-16T05:42:14Z")
**Posts on this page:** 8
**Page:** 1
### Author:  [@dkgibson](https://community.beestat.io/u/dkgibson)
#### Post date: [August 16, 2020, 5:42am UTC](https://community.beestat.io/t/ecobee-smart-sensor-consistency/216/1 "2020-08-16T05:42:14Z")
I wondered how much the ecobee Smart Sensors vary from each other, so I moved them all temporarily to a location without any air currents for about an hour (temperatures are Celsius). This screen shows they don’t vary much (I did occasionally see ± 0.1C variation):
Edit: From the Sensor Detail graph:
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### Author:  [@ziebelje](https://community.beestat.io/u/ziebelje)
#### Post date: [August 19, 2020, 11:08pm UTC](https://community.beestat.io/t/ecobee-smart-sensor-consistency/216/2 "2020-08-19T23:08:11Z")
I think the advertised accuracy is ±1.0°F. Pretty good to get a bunch right on!
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### Author:  [@dkgibson](https://community.beestat.io/u/dkgibson)
#### Post date: [August 21, 2020, 3:35pm UTC](https://community.beestat.io/t/ecobee-smart-sensor-consistency/216/3 "2020-08-21T15:35:31Z")
And all three 2-packs from different sources. One 2-pack was clearly “old stock”.
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### Author:  [@bmclaren99](https://community.beestat.io/u/bmclaren99)
#### Post date: [August 21, 2020, 4:31pm UTC](https://community.beestat.io/t/ecobee-smart-sensor-consistency/216/4 "2020-08-21T16:31:17Z")
Looks like you were very lucky. I have 5 myself, and found that they vary quite a bit. They are all within spec, but no where near as close as your ones are.
See [https://community.beestat.io/t/sensor-calibration-offset/137](https://community.beestat.io/t/sensor-calibration-offset/137) for my results…
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### Author:  [@dkgibson](https://community.beestat.io/u/dkgibson)
#### Post date: [August 21, 2020, 5:20pm UTC](https://community.beestat.io/t/ecobee-smart-sensor-consistency/216/5 "2020-08-21T17:20:10Z")
That’s very interesting.
I placed mine on a large table, with none of the sensors near the edge, & closed HVAC vents in the room.
From my prior experience with the same sensors on shelves in my family room, I learned that temperatures can vary significantly with sensors fairly close to each other on shelves in an area with human movement & HVAC airflow. And that was nothing compared to the variation when the sensors were further apart in the same room.
You might try your calibration again, in a room with no south-facing windows & no air circulation. Maybe the floor of a garage (assuming the engines in any vehicles there have not been run for at least 2-3 hours). Or maybe a closed bathroom?
ps: After a couple decades of using Celsius in everything (because aviation weather uses Celsius world-wide), I just (two days ago) switched back to (ugh) Fahrenheit, because consumer temperature products these days (including the ecobee) report temperatures in tenths, regardless of Celsius or Fahrenheit. That means I get more resolution (not necessarily accuracy) using Fahrenheit. It’s easier to see small movements in temperature in Fahrenheit (in this case).
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### Author:  [@bmclaren99](https://community.beestat.io/u/bmclaren99)
#### Post date: [August 21, 2020, 7:19pm UTC](https://community.beestat.io/t/ecobee-smart-sensor-consistency/216/6 "2020-08-21T19:19:33Z")
I was trying to calibrate them with reference to each other, as well as the ecobee itself. I had a shelf stuck to the wall at ecobee height. All 6 devices were no where near a HVAC vent, and within 6" of each other in a straight line against the wall. Can’t see the temperature changing that much within 6 inches on an interior wall 🙂
If you look at my graph, they all varied in the same pattern with a delta between them that stayed fairly consistent.
I did do the math, and they are all within spec of the +/- tolerance specified.
I should try again. Put my 5 in a small box. they would be isolate from any airflow, and the temperature in the box should be very constant.
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### Author:  [@dkgibson](https://community.beestat.io/u/dkgibson)
#### Post date: [August 22, 2020, 3:47am UTC](https://community.beestat.io/t/ecobee-smart-sensor-consistency/216/7 "2020-08-22T03:47:12Z")
Do you have the newer Smart Sensors or the older sensors?
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### Author:  [@bmclaren99](https://community.beestat.io/u/bmclaren99)
#### Post date: [August 22, 2020, 6:42pm UTC](https://community.beestat.io/t/ecobee-smart-sensor-consistency/216/8 "2020-08-22T18:42:34Z")
All newer Smart Sensors.